Telescopic standard or arm



Dec. 26, 1950 F. H. MAACK 2,535,803

TELESCOPIC STANDARD OR ARM Filed July 26, 1947 FRANTS H [N VEMTpE.

Patented Dec. 26, 1950 oam-cs 21535303 'TELESCOPIC STANDARD 50R "FrantsHeinrikMaack, DlenseJDenmark ,ApplicationJulyrftfi, 1947, Serial No. 763,787 In Denmark .0ctoher ;3,l-:1-945 "Section 1,Plililic"Law 690, August 8,1946 Tatent' exp'ircs October 3,1965

14 Claims.

"The inveritionmelatesito a telescopic standard corxarm for an iorgan consuming electriccurrent, .for instance a lamp :mounted at :one end of the :standard "with its conductors carried through the latter to the other end of the standarduwhich ,5

us ifastened in a centrallyllocated aperture in a areceptaclaior instance, a lamp base into which the conductors 23176 pushed upon the standard being telescoped, characterized by guiding-adewi'c'es through which .the part of the conductors situated at anytime in the receptacle will auto- -.matically 'occupyiwithout the employment of rguide-zrolls orithe like movable guid'e-Lmembersmpon the :standard being telescoped, -'a ,pre-arranged, evenly curved position, preferably coiling in windings similar to those of a rope-coil. Standards orsiarmfaretknownwhere a resilient steel tape, slightly curved transversal to its longitudinal direction, supports :the electric organ .and is arranged to be pushed, simultaneously with its coiling, into a cylindrical house in a manner similar to that of automatically unwinding steel tapemeters. Also, hoisting-lamps are known where the conductors are coiled, upon tt'he lamp-being pushed together, on a system of Lil'DllS in a-receptacle. These known constructions :are, however, mostcomplicated and reqdirepfor instance, drums acted upon by springs for the i'coiling-up-of the conductors, forthey arecclumsy and in eflicient, as the outer form of the whole apparatus is to such an .extent dependent upon and restricted by the construction that the esth'eticand practical demands to the article for rusein'question can ordinarily'notbe fulfilled.

'By the invention -a light and "elegant design is achieved that, furthermore, is inexpensive of production and massive and sturdy when employed. By an adequate form of construction according to the invention the conductor is arranged to be elastically bent and twisted to such an extent that it may be coiled-up in regular, spiral or screw-formed windings along the bottom or side-walls of the stationary receptacle, as the conductor, upon the telescoping of the standard, is pushed into the receptacle through a centrally arranged aperture of entering, hereby being essentially directed according to the axis of the windings, the drawn-out part of the stand ard having simultaneously suflicient supporting power and rigidity to support the electric organ at the momentary position of extension.

According to the invention the receptacle for housing the conductor may be located at one end of the standard, for instance, forming a base for the latter, or be intersecting the standard, in

ill

which latter case the :conductor smay be pllshed into the receptacle from either :side. Furthermore, "the conductor mayflaccording ate the invention be enclosed by arspiralispring :one iendzo'f which is fastened in the receptacle, the organ consuming electric current being fastened ,to its otherend. The spiral spring r-maybe o'f:such rigidity as to enable itsexten'ded'zpart-rto replace the standard, but according totheninventionnthe conductor, with or without ia rspiral spring, :may be enclosed, :at its length .cutside "the receptacle, by a telescopic tube, known :per :se, fastened tat one end to theelectric organ. In this .case the conductor orthe spiral spring enclosing ::it, may by means 0f its ifriction rdetain the :standard :in its momentary extended position, "01 ca ."spec'ial drag-spring coupling may according :toathe inyentiOn 'be employed in the telescope :connection, besideswhich may be arranged a special, possibly releasable, friction ::device for the .standard sand the conductor, .or the spiral spring :enclosing :it may according to the invention have such tension that it will automatically -:emerge from the u'eceptacle upon the friction device beingrre'l-eased.

I In such cases where "the conductor is arranged "conductor tightly extended within-the :sp'iral sprin-g, =as 'th'e cavity will offer azspace for :the

bights produced in this way.

Further characteristics according to the in vention will appear from the claims and the following description of the forms of construction shown on the drawing, where Figure 1 shows, in side view, a lamp with spiralspring standard in telescoped position,

Figure 2, same in partly extended position, partly in section,

Figure 3, horizontal section through base of same,

Figure 4, a bracket lamp with circular-curved telescope arm, in side view, and

Figure 4a, a longitudinal section through the base of a lamp with special guiding-device for the conductors.

In Figures 1-3, I represents a receptacle serving as a base for the lamp and in the form of :a low cylinder with a centrally arranged tube socket 2,

sleeve 35 and fastening-sleeve 35.

In receptacle I the end of a tightly wound spiral sprin 4 is fastened by means of clamp 3, the spring being carried out through tube socket 2, its other end being fastened to lamp socket 5. An electric conductor 6 is carried through spiral spring i to the lamp socket. As indicated in Figures 2 and 3 spiral spring is placing itself, on being introduced into receptacle i, in regular spiral windings and, in extended position, it is of sufiicient rigidity to detain lamp socket 5 with lamp, etc., in an adlibitive position of extension, as the friction at tube socket 2 is sufficient to prevent the spiral spring from being drawn out of or pushed into receptacle I.

In Figure 4 a bracket lamp is shown where a telescopic arm formed b three circularcurved tubes B! 9 is fastened to receptacle 1, the I latter serving as a base plate, the arm carrying at its end a lamp socket H. Through telescopic arm 8-16 a conductor of suitable stiffness has been drawn, at one end fastened to receptacle l and, upon the telescoping of the arm, placing itself in regular windings in receptacle I in a manner corresponding to that described above for spiral spring 5. The conductor may be enclosed in a spiral sprin at a tight fit, the spring possibly serving as part of the insulationand wearing-cover of the conductor. In the case that the conductor is lying loosely in the spiral spring it may be wound in screw-form, preferably in windings principally following the windings of the spring. In this manner the mutual friction by a long extension between spring and conductor is distributed uniformly, whereby the conductor is protected from local abuse.

In Figure 4a the end of a telescope tube 3i is fastened in front of the central hole in a lamp .base 32 through being screwed onto the end of a tube 34 provided with flange 33 for fastening. Tube 36 has an even curve and its other is carried out through the side-wall of lamp base 32 and fastened in this place by means of end- The conductors 32' drawn through the standard are carried through tube 34 which guides the part of the conductors located in base 32 in such manner that, upon the telescoping of the standard, they are carried in an even curve through the base and out of; the aperture in the side-wall of the latter.

Steel or other metal, or an adlibitive artificial substance of suitable strength and elasticity may be employed as material for the spiral springs and the like used in the invention, and instead of the spiral spring enclosing the conductor anelastic, flexible tube-hose of other construction may be employed.

Having thus described my invention, what I claim is: V

1. A telescopic standard comprising a plurality of tubes surrounding each other, the widest one being fastened to a receptacle forming the base of said standard, which extends from a central hole in the upper wall of said receptacle, said standard carrying at its upper end an electric current consuming device, needing an insulated current-feeding cable, the cable feeding said device being led through said standard and said hole into said receptacle, whence it can be connected to a source of electricity, said cable being insulated from but surrounded by a tightly wound helicoidal spring, one end of said spring being fastened to the upper end of the standardand the other end thereof being fastened inside of said receptacle laterally with respect to said central hole, the spring when the standard is pushed together coiling regularl to form a uniplanar helix, the axis of which is parallel to said standard, whilst maintaining said cable substantially immobile relative to said spring,

whereby the utilized cable length remains constant.

2. A standard as set forth in claim l,'the spring coiling to form a flat spiral, the plane of which is at right angles to the standard.

3. A standard as set forth in claim 1, the portion of the cable surrounded by the helicoidal spring having a greater length than said spring.

4. A standard as set forth in claim 1,'the cable surrounded by the helicoidal spring" bein also Wound helicoidally, whereby the windings of said cable substantially follow the windings of said spring.

FRANTS HEINRICH MAACK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 375,702 Fasoldt Dec. 27, 1887 960,723 smith June 7, 1910 1,663,357 Stephan Mar. 20, 1928 1,682,342 Kraft Aug. 28, 1928 1,854,932 Gottlieb Apr. 19, 1932 2,299,785 Barrett Oct. 27, 1942 FOREIGN PATENTS Number Country Date 438,549 France May 20, 1912 740,483 France Jan. 26, 1933 

